/* =========================================================
 * aiAlbumWebsite v2.1 · 蓝湖原型规格
 * 字体：思源黑体/PingFang（国内）· Poppins（海外）· Turnpike（badge 数字）
 * 基准：1920 设计稿 → clamp() 比例缩放
 * ========================================================= */
:root {
  --font-cn: 'Source Han Sans SC', 'Source Han Sans CN', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-intl: 'Poppins', 'Source Han Sans SC', 'PingFang SC', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --ink: #000;
  --ink-70: rgba(0, 0, 0, .7);
  --ink-50: rgba(0, 0, 0, .5);
  --ink-brand: #1C1C1C;
  --brand: #2F81FF;
  --purple: #5B29D7;
  --section-blue: #E9EFFA;
  --bg-page: #FBFCFE;
  --line: #E9EDF4;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-cn);
  color: var(--ink);
  background: var(--bg-page);
  line-height: 1.6;
  overflow-x: hidden;
}
html[data-region="intl"] body { font-family: var(--font-intl); }
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; }

.container { width: 100%; max-width: 1488px; margin: 0 auto; padding: 0 24px; }

/* ================= 通用按钮 ================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: clamp(38px, 2.4vw, 46px);
  padding: 0 clamp(18px, 1.4vw, 27px);
  border-radius: 10px;
  font-size: clamp(13px, .94vw, 18px);
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  border: 0;
  transition: transform .25s, box-shadow .25s, background .25s;
}
.btn-primary {
  background: linear-gradient(180deg, #4B7BFF 0%, #2F62F0 100%);
  color: #fff;
  box-shadow: 0 6px 18px rgba(47, 98, 240, .25);
  gap: 8px;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(47, 98, 240, .35); }
.btn-video {
  background: transparent;
  color: #2F81FF;
  border: 1px solid #2F81FF;
  box-shadow: none;
  gap: 8px;
}
.btn-video:hover { background: rgba(47, 129, 255, .08); transform: translateY(-1px); }

/* CTA（设计稿 170×50 渐变切图底） */
.btn-cta {
  display: inline-flex; align-items: center; justify-content: center;
  width: clamp(150px, 8.9vw, 170px);
  height: clamp(44px, 2.6vw, 50px);
  background: linear-gradient(135deg, #5564FD 0%, #3D66FD 100%);
  color: #fff;
  font-size: clamp(13px, .83vw, 16px);
  font-weight: 500;
  letter-spacing: .5px;
  transition: transform .25s, filter .25s;
}
.btn-cta:hover { transform: translateY(-2px); filter: brightness(1.06); }
.btn-cta span { text-shadow: 0 1px 4px rgba(40, 60, 160, .35); }

/*================= Header ================= */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.site-header.scrolled {
  background: rgba(255, 255, 255, .86);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  box-shadow: 0 6px 24px rgba(30, 50, 100, .08);
}
.nav-wrap {
  display: flex; align-items: center;
  height: clamp(64px, 5.6vw, 107px);
  gap: clamp(20px, 3vw, 56px);
}
.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink-brand);
  font-size: clamp(24px, 1.875vw, 36px);
  font-weight: 500;
 white-space: nowrap; }
.nav-logo { border-radius: 10px; }
.nav-links { display: flex; gap: clamp(22px, 2.4vw, 46px); margin-left: auto; }
.nav-links a {
  font-size: clamp(14px, .94vw, 18px);
  font-weight: 500;
  color: var(--ink);
  position: relative;
  padding: 6px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 2px; background: var(--brand); border-radius: 2px;
  transition: right .28s;
}
.nav-links a:hover::after { right: 0; }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.lang-btn {
  border: 0; cursor: pointer;
  background: linear-gradient(90deg, #3E6FFF 0%, #5B3DF5 100%);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  padding: 9px 26px;
  border-radius: 10px;
  transition: transform .25s, box-shadow .25s;
}
.lang-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(70, 90, 245, .35); }
.nav-burger { display: none; }

.mobile-menu {
  display: none;
  flex-direction: column;
  background: rgba(255, 255, 255, .96);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  padding: 8px 24px 18px;
  box-shadow: 0 14px 30px rgba(30, 50, 100, .10);
}
.mobile-menu a { padding: 12px 0; font-size: 16px; font-weight: 500; border-bottom: 1px solid #F0F3FA; }
.mobile-menu.open { display: flex; }

/* ================= Hero ================= */
.hero { position: relative; background: linear-gradient(180deg, #EAF2FC 0%, #E7EFFB 100%); }
.hero-bg { width: 100%; height: auto; }
.hero-inner { position: absolute; inset: 0; display: block; }
.hero-copy { max-width: 640px; padding-top: clamp(120px, 17vw, 330px); margin-left: clamp(0px, .4vw, 10px); }
.hero-title {
  font-size: clamp(34px, 2.6vw, 50px);
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: 0;
}
.hero-t2 { color: var(--brand); }
html[data-region="intl"] .hero-title { letter-spacing: -.5px; }
.hero-sub {
  margin-top: clamp(16px, 1.5vw, 28px);
  font-size: clamp(15px, 1.042vw, 20px);
  font-weight: 500;
  line-height: 1.55;
  color: var(--ink-70);
  max-width: 30em;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: clamp(10px, .9vw, 17px); margin-top: clamp(24px, 2.4vw, 46px); }

/* ================= 区块标题 ================= */
.section-head { text-align: center; }
.section-head h2 {
  font-size: clamp(30px, 2.6vw, 50px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -1px;
}
html[data-region="intl"] .section-head h2 { letter-spacing: 0; }
.section-head p { margin-top: 6px; font-size: clamp(14px, 1.042vw, 20px); color: var(--ink-70); }

/* ================= 核心功能（标题叠 hero 波浪，向下渐白） ================= */
.features {
  position: relative;
  margin-top: clamp(-430px, -22.4vw, -220px);
  padding: 0 0 clamp(56px, 5vw, 96px);
  background: transparent;
}
.features::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0;
  height: clamp(260px, 27vw, 540px);
  background: linear-gradient(180deg, rgba(251, 252, 254, 0) 0%, rgba(251, 252, 254, .55) 34%, rgba(251, 252, 254, .97) 74%, #FBFCFE 100%);
  pointer-events: none;
}
.features > .container { position: relative; z-index: 1; max-width: 1750px; }
.feature-grid {
  margin-top: clamp(40px, 4.7vw, 90px);
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: clamp(18px, 1.9vw, 36px);
  align-items: start;
}
.feature-card { text-align: center; }
.feature-card img { width: 100%; max-width: 311px; height: auto; display: block; margin: 0 auto; }

/* ================= 产品特性 01-04（垂直布局） ================= */
.showcase {
  background: linear-gradient(180deg, #FBFCFE 0%, var(--section-blue) clamp(120px, 9vw, 180px));
  padding: clamp(20px, 1.8vw, 34px) 0 clamp(24px, 2vw, 40px);
}
.feat-sec { padding: clamp(18px, 1.9vw, 36px) 0; }
.feat-grid {
  display: grid; grid-template-columns: minmax(0, .423fr) minmax(0, 1fr);
  gap: clamp(28px, 3.1vw, 60px);
  align-items: start;
}
.feat-sec.flip .feat-grid { grid-template-columns: minmax(0, 1fr) minmax(0, .423fr); }
.feat-sec.flip .feat-copy { order: 2; padding-top: clamp(8px, 1.2vw, 22px); }
.feat-sec.flip .feat-media { order: 1; padding-top: clamp(8px, 1.2vw, 22px); }
/* 步骤4特殊调整：左侧图片与右侧文案顶部对齐 */
.feat-sec:nth-of-type(4).flip .feat-media { padding-top: 0; margin-top: -40px; }
.feat-sec:nth-of-type(4).flip .feat-copy { padding-top: 0; }
.feat-head { display: flex; align-items: center; gap: clamp(12px, 1vw, 20px); }
.feat-num { width: 56px; height: 56px; flex: none; }
.feat-head h3 { font-size: clamp(19px, 1.354vw, 26px); font-weight: 700; }
.feat-lead {
  margin-top: clamp(22px, 2.4vw, 46px);
  font-size: clamp(18px, 1.354vw, 26px);
  font-weight: 700;
  line-height: 1.55;
}
.feat-p {
  margin-top: clamp(10px, .9vw, 17px);
  font-size: clamp(14px, 1.042vw, 20px);
  font-weight: 500;
  line-height: 1.65;
  color: var(--ink-70);
  max-width: 21.5em;
}
.feat-sub { margin-top: clamp(18px, 1.9vw, 36px); font-size: clamp(17px, 1.354vw, 26px); font-weight: 700; }
.feat-media { display: flex; flex-direction: column; align-items: center; gap: clamp(16px, 1.4vw, 27px); min-width: 0; }
.feat-sec:nth-of-type(4) .feat-media { gap: clamp(8px, .8vw, 14px); }
.feat-img { width: 100%; height: auto; }

/* 02 屏保轮播（官方壁纸 交叉淡入） */
.scr-dot:hover { background: #A7B8E2; }
.scr-dot.is-active { width: 24px; background: var(--purple); }

/* ================= 用户有话说（背景=设计稿渐变切图整段铺满） ================= */
.voices { position: relative; overflow: hidden; padding: clamp(64px, 5.2vw, 100px) 0 clamp(80px, 6.7vw, 128px); background: #DEE9FB; }
.voices-bg {
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  object-fit: cover; object-position: center bottom;
  pointer-events: none;
}
.voices-inner { position: relative; z-index: 1; }
.voices .section-head p { color: var(--ink-70); }
.quote-card {
  width: min(640px, 94%);
  margin: clamp(28px, 3vw, 52px) auto 0;
  background: center / 100% 100% no-repeat;
  padding: clamp(56px, 6vw, 104px) clamp(26px, 4.5vw, 80px) clamp(24px, 3vw, 50px);
  text-align: center;
}
.quote-quote {
  font-size: clamp(17px, 1.25vw, 24px);
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: .4px;
}
.quote-text {
  margin-top: clamp(10px, 1vw, 18px);
  font-size: clamp(14px, .9vw, 17px);
  line-height: 1.8;
  color: var(--ink-70);
  white-space: pre-line;
}
.quote-sign {
  margin-top: clamp(12px, 1.2vw, 20px);
  font-size: clamp(13px, .85vw, 16px);
  font-weight: 500;
  color: rgba(0, 0, 0, .55);
}
.quote-viewport { display: grid; }
.quote-slide {
  grid-area: 1 / 1;
  opacity: 0;
  transition: opacity .65s ease;
  pointer-events: none;
}
.quote-slide.on { opacity: 1; pointer-events: auto; }
.quote-dots { display: flex; justify-content: center; gap: 8px; margin-top: clamp(14px, 1.4vw, 24px); }
.q-dot {
  width: 8px; height: 8px; border-radius: 999px;
  background: rgba(0, 0, 0, .22); border: 0; padding: 0; cursor: pointer;
  transition: width .3s ease, background .3s ease;
}
.q-dot.on { width: 22px; background: var(--purple); }
.voices-avatars { position: absolute; inset: 0; pointer-events: none; }
.v-avatar { position: absolute; border-radius: 50%; overflow: hidden; box-shadow: 0 10px 26px rgba(30, 50, 120, .18); ;
  animation: floatY var(--fd, 7s) ease-in-out var(--fdel, 0s) infinite;
  will-change: transform;
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-9px); }
}
.v-avatar.a1 { --fd: 7s;   --fdel: 0s;   }
.v-avatar.a2 { --fd: 8.4s; --fdel: .6s;  }
.v-avatar.a3 { --fd: 6.6s; --fdel: 1.2s; }
.v-avatar.a4 { --fd: 9s;   --fdel: .3s;  }
.v-avatar.a5 { --fd: 7.6s; --fdel: .9s;  }
.v-avatar.a6 { --fd: 8.2s; --fdel: 1.5s; }
.v-avatar.a7 { --fd: 6.8s; --fdel: .5s;  }
.v-avatar.a8 { --fd: 9.2s; --fdel: 1.1s; }
@media (prefers-reduced-motion: reduce) {
  .v-avatar { animation: none; }
}
.v-avatar img { width: 100%; height: 100%; object-fit: cover; }
.a1 { left: 8%;  top: 16%; width: clamp(40px, 3.9vw, 75px); height: clamp(40px, 3.9vw, 75px); }
.a2 { left: 3%;  top: 52%; width: clamp(30px, 2.2vw, 42px); height: clamp(30px, 2.2vw, 42px); }
.a3 { left: 14%; top: 72%; width: clamp(34px, 3vw, 58px); height: clamp(34px, 3vw, 58px); }
.a4 { left: 24%; top: 34%; width: clamp(30px, 2.2vw, 42px); height: clamp(30px, 2.2vw, 42px); }
.a5 { right: 20%; top: 20%; width: clamp(34px, 3vw, 58px); height: clamp(34px, 3vw, 58px); }
.a6 { right: 8%;  top: 44%; width: clamp(40px, 3.9vw, 75px); height: clamp(40px, 3.9vw, 75px); }
.a7 { right: 22%; top: 68%; width: clamp(30px, 2.2vw, 42px); height: clamp(30px, 2.2vw, 42px); }
.a8 { right: 5%;  top: 78%; width: clamp(34px, 3vw, 58px); height: clamp(34px, 3vw, 58px); }

/* ================= 下载区 ================= */
.download { background: #fff; padding: clamp(64px, 6vw, 116px) 0 clamp(56px, 5vw, 96px); }
.dl-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.4fr);
  gap: clamp(32px, 4vw, 80px);
  align-items: center;
}
.download-copy h2 { font-size: clamp(30px, 2.6vw, 50px); font-weight: 700; line-height: 1.24; }
.download-copy p { margin-top: clamp(12px, 1vw, 20px); font-size: clamp(14px, 1.042vw, 20px); color: var(--ink-70); }
.dl-cards { display: flex; justify-content: flex-end; gap: clamp(24px, 5vw, 96px); }
.dl-card {
  display: block;
  width: clamp(240px, 21.7vw, 417px);
  height: auto;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(40, 60, 130, .13);
  transition: transform .3s, box-shadow .3s;
}
.dl-card:hover { transform: translateY(-6px); box-shadow: 0 26px 60px rgba(40, 60, 130, .2); }
.dl-headunit-wrap {
  position: relative;
  border-radius: 18px;
  transition: transform .3s;
}
.dl-headunit-wrap .dl-card:hover { transform: none; }
.dl-headunit-wrap:hover { transform: translateY(-6px); }
.dl-headunit-wrap:hover .dl-card { box-shadow: 0 26px 60px rgba(40, 60, 130, .2); }
.cn-download-hotspot {
  position: absolute;
  left: 6.2%;
  bottom: 4.3%;
  width: 44.4%;
  height: 9.4%;
  z-index: 2;
  border: 0;
  border-radius: 7px;
  background: transparent;
  cursor: pointer;
  transition: box-shadow .2s, transform .2s;
}
.cn-download-hotspot:hover { box-shadow: 0 0 0 3px rgba(255, 255, 255, .62), 0 8px 20px rgba(63, 92, 245, .35); }
.cn-download-hotspot:focus-visible { outline: 3px solid #111; outline-offset: 3px; }
.cn-download-hotspot:active { transform: scale(.98); }
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ================= 页脚（顶部分隔线与上方分界） ================= */
.footer { background: #fff; padding-top: clamp(20px, 1.8vw, 34px); }
.footer-main {
  border-top: 1px solid var(--line);
  padding-top: clamp(24px, 1.8vw, 34px);
  padding-bottom: clamp(28px, 2.4vw, 46px);
  display: flex; justify-content: space-between; align-items: flex-start; gap: 32px;
}
.ft-title { font-size: clamp(16px, 1.042vw, 20px); font-weight: 700; }
.ft-line {
  margin-top: clamp(10px, .8vw, 15px);
  display: flex; align-items: center; gap: 9px;
  font-size: clamp(14px, .94vw, 18px);
  color: var(--ink-70);
}
.ft-ic { width: 18px; height: 18px; flex: none; }
.ft-mail { width: clamp(16px, 1.042vw, 20px); height: auto; }
html[data-region="cn"] .ft-mail { display: none; }
html[data-region="intl"] .ft-phone-ic { display: none; }
.footer-qr { text-align: center; }
.footer-qr img { width: clamp(72px, 6vw, 116px); height: auto; margin: 0 auto; }
.footer-qr p { margin-top: 8px; font-size: clamp(12px, .83vw, 16px); color: var(--ink-70); }
.footer-bar { border-top: 1px solid #ECF0F7; padding: clamp(14px, 1.2vw, 22px) 0; }
.footer-bar p { text-align: center; font-size: clamp(12px, .73vw, 14px); color: var(--ink-50); }

/* ================= 入场动效 ================= */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* =========================================================
 * 平板（≤1160）
 * ========================================================= */
@media (max-width: 1160px) {
  .container { padding: 0 24px; }
  .nav-links { gap: 22px; }
  .hero-copy { margin-left: 12px; max-width: 56%; }
  .feature-grid { grid-template-columns: repeat(3, 1fr); gap: 20px 16px; }
  .feat-p { max-width: 40ch; }
  .dl-cards { gap: 24px; }
}

/* =========================================================
 * 手机（≤820）：hero 上下堆叠，特性区单列
 * ========================================================= */
@media (max-width: 820px) {
  .nav-brand { font-size: 21px; gap: 8px; }
  .nav-logo { width: 32px; height: 32px; }
  .lang-btn { padding: 7px 16px; font-size: 13px; }

  .nav-links { display: none; }
  .nav-burger {
    display: flex; flex-direction: column; gap: 5px;
    background: none; border: 0; cursor: pointer; padding: 8px;
  }
  .nav-burger span { width: 22px; height: 2px; background: var(--ink-brand); border-radius: 2px; }
  .nav-actions { margin-left: auto; }

  .hero { display: flex; flex-direction: column; }
  .hero-inner { position: static; order: 1; padding: 96px 0 10px; }
  .hero-copy { max-width: 640px; margin: 0 auto; padding: 0 8px; text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-bg { order: 2; width: 118%; max-width: none; margin-left: -9%; }

  .features { margin-top: clamp(-430px, -22.4vw, -220px); }
  .features::before { height: 220px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); gap: 20px 14px; }
  .feature-card:nth-child(4), .feature-card:nth-child(5) { grid-column: auto; justify-self: center; width: min(320px, 94%); }
  .feature-card:nth-child(3) { grid-column: 1 / -1; justify-self: center; width: min(320px, 94%); }

  .feat-sec { padding: 34px 0 26px; }
  .feat-grid, .feat-sec.flip .feat-grid { grid-template-columns: 1fr; gap: 22px; }
  .feat-sec.flip .feat-copy { order: 1; }
  .feat-sec.flip .feat-media { order: 2; }
  .feat-media { gap: 16px; }

  .quote-card { padding: 11% 8% 9%; }
  .v-avatar:nth-child(2), .v-avatar:nth-child(7) { display: none; }

  .dl-grid { grid-template-columns: 1fr; }
  .download-copy { text-align: center; }
  .dl-cards { justify-content: center; flex-wrap: wrap; }

  .footer-main { flex-direction: column; align-items: flex-start; gap: 24px; }
  .footer-qr { align-self: center; text-align: center; }
}

/* 深色滚动条微调（webkit） */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-thumb { background: #C6D2EE; border-radius: 8px; }
::-webkit-scrollbar-track { background: transparent; }

/* ---- v2.1d：特性图按设计出血贴页面边 ---- */
@media (min-width: 1161px) {
  .feat-sec:not(.flip) .feat-media { margin-right: min(0px, calc((1440px - 100vw)/2 + 24px)); }
  .feat-sec.flip .feat-media { margin-left: min(0px, calc((1440px - 100vw)/2 + 24px)); }
}

/* ---- v2.1g：CTA 按钮对准图片主体（按设计稿坐标） ---- */
@media (min-width: 821px) {
  .feat-sec:not(.flip) .btn-cta { align-self: flex-start; margin-left: calc(58.5% - 85px); }
  .feat-sec.flip .btn-cta { align-self: flex-start; margin-left: calc(45% - 85px); }
}
@media (max-width: 820px) {
  .feat-sec .btn-cta { align-self: center; margin-left: 0; }
}

/* ================= 02 扇形3D手风琴轮播 ================= */
.acc-stage {
  position: relative;
  width: min(95%, 1000px);
  aspect-ratio: 16 / 10;
  margin: 0 auto;
  perspective: 2000px;
  perspective-origin: 50% 50%;
  overflow: visible;
}
.acc-card {
  position: absolute; left: 50%; top: 50%;
  width: 48%;
  aspect-ratio: 16 / 9.5;
  padding: 0;
  background: transparent;
  border-radius: 12px;
  border: none;
  box-shadow: 
    0 35px 90px rgba(0, 0, 0, .35),
    0 15px 40px rgba(0, 0, 0, .25),
    0 5px 15px rgba(0, 0, 0, .15);
  transform-style: preserve-3d;
  transition: transform .75s cubic-bezier(.25, .9, .3, 1), opacity .5s ease, filter .5s ease, box-shadow .5s ease;
  cursor: pointer;
  overflow: hidden;
  -webkit-box-reflect: below 12px linear-gradient(transparent 65%, rgba(0, 0, 0, .12));
}
.acc-card:hover {
  box-shadow: 
    0 40px 100px rgba(0, 0, 0, .4),
    0 20px 50px rgba(0, 0, 0, .3),
    0 8px 20px rgba(0, 0, 0, .2);
}
.acc-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 12px;
  display: block;
  user-select: none;
  position: relative;
  z-index: 1;
}
/* 指示点 */
.acc-dots { display: flex; justify-content: center; gap: 8px; margin-top: clamp(18px, 2vw, 30px); }
.acc-dot {
  width: 8px; height: 8px; border-radius: 999px;
  background: rgba(20, 30, 80, .22); border: 0; padding: 0; cursor: pointer;
  transition: width .3s ease, background .3s ease;
}
.acc-dot.on { width: 22px; background: var(--purple); }
/* 02 按钮居中（参考图：按钮居中于手风琴下方） */
.feat-sec:nth-of-type(2) .feat-media .btn-cta { align-self: center; margin-left: 0; }

/* 03 放松模式按钮居中 */
.feat-sec:nth-of-type(3) .feat-media .btn-cta { align-self: center; margin-left: 0; }
@media (max-width: 1160px) {
  .acc-stage { width: 100%; }
  .acc-card { width: 50%; }
}
@media (max-width: 820px) {
  .acc-stage { aspect-ratio: 16 / 10.5; }
  .acc-card { width: 60%; border-radius: 10px; }
  .acc-card img { border-radius: 7px; }
  -webkit-box-reflect: below 8px;
}

/* ================= 03 放松模式轮播（车机边框 + 淡入淡出） ================= */
.relax-stage {
  position: relative;
  width: min(88%, 800px);
  margin: 0 auto;
  padding: 12px 12px 28px;
  background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 100%);
  border-radius: 16px;
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, .3),
    0 20px 50px rgba(0, 0, 0, .25),
    inset 0 1px 0 rgba(255, 255, 255, .08);
}
.relax-stage::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  bottom: 28px;
  border-radius: 8px;
  background: linear-gradient(180deg, #000 0%, #0a0a0a 100%);
  z-index: 0;
}
.relax-screen {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9.6;
  border-radius: 8px;
  overflow: hidden;
  z-index: 1;
  background: #000;
}
.relax-slide {
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity .8s ease;
  pointer-events: none;
}
.relax-slide.on { opacity: 1; pointer-events: auto; }
.relax-slide img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.relax-stand {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 40%;
  height: 8px;
  background: linear-gradient(180deg, #3a3a3a 0%, #2a2a2a 100%);
  border-radius: 0 0 4px 4px;
  z-index: 2;
}
.relax-stage::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: 10%;
  right: 10%;
  height: 60px;
  background: linear-gradient(180deg, rgba(0, 0, 0, .15) 0%, transparent 100%);
  filter: blur(8px);
  transform: scaleY(-1);
  opacity: .4;
  pointer-events: none;
  z-index: 0;
}
.relax-dots { display: flex; justify-content: center; gap: 8px; margin-top: clamp(18px, 2vw, 30px); }
.relax-dot {
  width: 8px; height: 8px; border-radius: 999px;
  background: rgba(20, 30, 80, .22); border: 0; padding: 0; cursor: pointer;
  transition: width .3s ease, background .3s ease;
}
.relax-dot.on { width: 22px; background: var(--purple); }

@media (max-width: 820px) {
  .relax-stage { width: 100%; padding: 8px 8px 24px; border-radius: 12px; }
  .relax-stage::before { top: 8px; left: 8px; right: 8px; bottom: 24px; border-radius: 6px; }
  .relax-screen { aspect-ratio: 16 / 10.5; border-radius: 6px; }
  .relax-stand { bottom: -6px; height: 6px; width: 35%; }
  .relax-stage::after { bottom: -50px; height: 50px; }
}

/* ---- v3.1 手机菜单语言切换 ---- */
.mm-lang {
  align-self: flex-start;
  margin-top: 10px;
  font-family: inherit;
  cursor: pointer;
}

/* ---- v3.2 微信卡小程序码（仅国内） ---- */
.dl-card-wrap { position: relative; display: inline-flex; }
.dl-wechat-qr {
  position: absolute;
  right: clamp(12px, 1.15vw, 22px);
  bottom: clamp(12px, 1.15vw, 22px);
  width: clamp(48px, 4.5vw, 80px);
  height: auto;
  background: #fff;
  padding: clamp(4px, .4vw, 6px);
  border-radius: 10px;
  box-shadow: 0 6px 16px rgba(30, 40, 90, .15);
}
html[data-region="intl"] .dl-wechat-qr { display: none; }
@media (max-width: 820px) {
  .dl-wechat-qr { width: clamp(40px, 14vw, 56px); right: 8px; bottom: 8px; padding: 3px; border-radius: 7px; }
}

/* ---- 海外版三栏下载卡片：左侧文案 + 右侧三列卡片 ---- */
.dl-intl-cards {
  display: none;
  grid-template-columns: minmax(0, .45fr) minmax(0, 1.55fr);
  gap: clamp(32px, 4vw, 80px);
  align-items: center;
  grid-column: 1 / -1;
}
html[data-region="intl"] .dl-intl-cards { display: grid; }
html[data-region="intl"] .dl-cards { display: none; }
html[data-region="intl"] .download-copy { display: none; }

.dl-intl-title {
  padding-top: clamp(8px, 1vw, 16px);
}
.dl-intl-title h2 {
  font-size: clamp(26px, 2.2vw, 42px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.5px;
  color: var(--ink);
}
.dl-intl-title p {
  margin-top: clamp(8px, .8vw, 14px);
  font-size: clamp(12px, .85vw, 16px);
  color: var(--ink-70);
  line-height: 1.6;
  max-width: 18em;
}

.dl-intl-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2vw, 32px);
  min-width: 0;
  width: 100%;
}

.dl-intl-card {
  min-width: 0;
  width: 100%;
  background: transparent;
  border: 1px dashed rgba(0, 0, 0, .15);
  border-radius: 16px;
  padding: clamp(16px, 1.8vw, 28px);
  text-align: center;
  transition: transform .3s, box-shadow .3s;
}
.dl-intl-card--featured {
  background: #fff;
  border: none;
  box-shadow: 0 8px 30px rgba(40, 60, 130, .08);
}
.dl-intl-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(40, 60, 130, .12);
}
.dl-intl-card--featured:hover {
  box-shadow: 0 14px 40px rgba(40, 60, 130, .15);
}
.dl-intl-img {
  width: 100%;
  max-width: 200px;
  height: auto;
  border-radius: 10px;
  margin: 0 auto clamp(12px, 1.2vw, 18px);
  display: block;
}
.dl-intl-card h3 {
  font-size: clamp(16px, 1.2vw, 22px);
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
}
.dl-intl-card p {
  font-size: clamp(11px, .8vw, 13px);
  color: var(--ink-70);
  line-height: 1.6;
  margin-bottom: clamp(12px, 1vw, 16px);
  min-height: 40px;
  overflow-wrap: break-word;
  word-break: break-word;
}
.dl-intl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  background: #2F81FF;
  color: #fff;
  border-radius: 8px;
  font-size: clamp(12px, .85vw, 14px);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background .25s, transform .25s;
}
.dl-intl-btn:hover {
  background: #1a6de0;
  transform: translateY(-2px);
}
.dl-intl-btn svg { flex-shrink: 0; }

/* =========================================================
 * 车机策略选择弹窗
 * ========================================================= */
.download-dialog {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.download-dialog[hidden] { display: none; }
.download-dialog-overlay {
  position: absolute;
  inset: 0;
  background: rgba(16, 24, 48, .52);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.download-dialog-panel {
  position: relative;
  z-index: 1;
  width: min(100%, 480px);
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 32px;
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 28px 80px rgba(20, 32, 72, .25);
}
.download-dialog-panel h2 {
  padding-right: 36px;
  font-size: 24px;
  line-height: 1.35;
  color: var(--ink-brand);
}
.download-dialog-close {
  position: absolute;
  top: 18px;
  right: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  background: #F2F4F8;
  color: #5A6170;
  cursor: pointer;
  transition: background .2s, transform .2s;
}
.download-dialog-close:hover { background: #E8EBF1; transform: rotate(90deg); }
.download-dialog-close:focus-visible,
.download-dialog-btn:focus-visible,
.download-strategy-option input:focus-visible + .download-strategy-radio {
  outline: 3px solid rgba(47, 129, 255, .35);
  outline-offset: 2px;
}
.download-strategies {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  border: 0;
}
.download-strategy-option {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 54px;
  padding: 12px 16px;
  border: 1px solid #E3E7EF;
  border-radius: 12px;
  color: #242833;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color .2s, background .2s, box-shadow .2s;
}
.download-strategy-option:hover { border-color: #9DBEFF; background: #F8FAFF; }
.download-strategy-option:has(input:checked) {
  border-color: var(--brand);
  background: #F3F7FF;
  box-shadow: 0 0 0 2px rgba(47, 129, 255, .1);
}
.download-strategy-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.download-strategy-radio {
  position: relative;
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  border: 2px solid #AEB6C5;
  border-radius: 50%;
  background: #fff;
}
.download-strategy-option input:checked + .download-strategy-radio { border-color: var(--brand); }
.download-strategy-option input:checked + .download-strategy-radio::after {
  content: '';
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--brand);
}
.download-dialog-status {
  margin-top: 14px;
  color: #D14343;
  font-size: 14px;
  line-height: 1.5;
}
.download-dialog-status[hidden] { display: none; }
.download-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 28px;
}
.download-dialog-btn {
  min-width: 104px;
  height: 44px;
  padding: 0 20px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .2s, background .2s, opacity .2s;
}
.download-dialog-btn--cancel { border: 1px solid #DDE2EB; background: #fff; color: #424957; }
.download-dialog-btn--cancel:hover { background: #F6F7FA; }
.download-dialog-btn--primary { border: 0; background: linear-gradient(90deg, #3E6FFF 0%, #5B3DF5 100%); color: #fff; }
.download-dialog-btn--primary:hover:not(:disabled) { transform: translateY(-1px); }
.download-dialog-btn--primary:disabled { opacity: .45; cursor: not-allowed; }

.mobile-download-dialog-panel {
  width: min(100%, 420px);
  text-align: center;
}
.mobile-download-dialog-panel h2 { padding: 0 38px; }
.mobile-download-qr {
  width: min(100%, 300px);
  height: auto;
  margin: 24px auto 0;
  border-radius: 12px;
}

@media (max-width: 1160px) {
  .dl-intl-cards {
    grid-template-columns: 1fr;
    gap: clamp(24px, 3vw, 40px);
  }
  .dl-intl-title {
    text-align: center;
    padding-top: 0;
  }
  .dl-intl-title p {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 820px) {
  .dl-intl-col {
    grid-template-columns: 1fr;
    gap: clamp(16px, 2vw, 24px);
  }
  .dl-intl-card p { min-height: auto; }
  .download-dialog { padding: 16px; align-items: flex-end; }
  .download-dialog-panel {
    width: 100%;
    max-height: calc(100vh - 32px);
    padding: 28px 20px 20px;
    border-radius: 18px;
  }
  .download-dialog-panel h2 { font-size: 21px; }
  .download-dialog-actions { margin-top: 22px; }
  .download-dialog-btn { flex: 1; min-width: 0; }
  .mobile-download-dialog-panel { padding-bottom: 28px; }
  .mobile-download-qr { width: min(100%, 280px); margin-top: 20px; }
}

/* =========================================================
 * 视频底部抽屉（苹果官网风格）
 * ========================================================= */
.video-drawer {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity .4s ease, visibility .4s ease;
}
.video-drawer.active {
  opacity: 1;
  visibility: visible;
}
.video-drawer[hidden] { display: flex; }

.video-drawer-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, .5);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  cursor: pointer;
}

.video-drawer-content {
  position: relative;
  z-index: 1;
  width: min(95vw, 1200px);
  max-height: 85vh;
  background: #000;
  border-radius: 20px;
  padding: 8px 12px 12px;
  transform: translateY(100%);
  transition: transform .5s cubic-bezier(.32, .72, 0, 1);
  display: flex;
  flex-direction: column;
  margin-bottom: 24px;
}
.video-drawer.active .video-drawer-content {
  transform: translateY(0);
}

.video-drawer-handle {
  width: 40px;
  height: 4px;
  background: rgba(255, 255, 255, .3);
  border-radius: 2px;
  margin: 0 auto 16px;
  flex-shrink: 0;
}

.video-drawer-close {
  position: absolute;
  top: 12px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .12);
  border: 0;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .25s, transform .25s;
  z-index: 2;
}
.video-drawer-close:hover {
  background: rgba(255, 255, 255, .22);
  transform: rotate(90deg);
}

.video-drawer-player {
  width: 100%;
  max-height: calc(85vh - 52px);
  border-radius: 12px;
  box-shadow: 0 -8px 40px rgba(0, 0, 0, .3);
  background: #000;
  display: block;
}

@media (max-width: 820px) {
  .video-drawer-content {
    width: 100vw;
    max-height: 80vh;
    border-radius: 16px 16px 0 0;
    padding: 10px 12px 16px;
  }
  .video-drawer-handle {
    width: 32px;
    height: 3px;
    margin-bottom: 12px;
  }
  .video-drawer-close {
    top: 8px;
    right: 12px;
    width: 32px;
    height: 32px;
  }
  .video-drawer-player {
    border-radius: 8px;
  }
}